[rdiff-backup-users] Why do I see a huge variation in the time rdiff-backup takes?

[Segundo Bob]

I run rdiff-backup on my desktop computer to backup data from my
internal hard drive to a removable internal hard drive.  I use a script
to do the backup every Sunday.  Unpredictably, infrequently rdiff-backup
runs much, much longer than usual.  Why?

I'm asking now because yesterday rdiff-backup ran for 3 hours and 6
minutes when I expected it to run between 5 minutes and 20 minutes.

Is there a problem switching from 32-bit to 64-bit?

Thanks for any help you can give.

Here are the backup statistics and my notes:

        2015-03-15 - Created a new archive file.
                Xubuntu32 12.04
                rdiff-backup 1.2.8
                Removable drive connected to a
                motherboard SATA port
                19 minutes 17.45 seconds
        2015-03-22 - Xubuntu32 12.04
                rdiff-backup 1.2.8
                Removable drive connected to a
                motherboard SATA port
                3 minutes 43.82 seconds
        2015-03-29 - Xubuntu64 14.04
                rdiff-backup 1.2.8
                Removable drive connected to
                a PCIe SATA card
                3 hours 5 minutes 36.81 seconds
        2015-03-30 - Xubuntu64 14.04
                rdiff-backup 1.2.8
                Removable drive connected to
                a PCIe SATA card
                4 minutes 42.97 seconds


session_statistics.2015-03-15T17:44:28-07:00.data

StartTime 1426466668.00 (Sun Mar 15 17:44:28 2015)
EndTime 1426467825.45 (Sun Mar 15 18:03:45 2015)
ElapsedTime 1157.45 (19 minutes 17.45 seconds)
SourceFiles 190944
SourceFileSize 37069994870 (34.5 GB)
MirrorFiles 1
MirrorFileSize 0 (0 bytes)
NewFiles 190943
NewFileSize 37069994870 (34.5 GB)
DeletedFiles 0
DeletedFileSize 0 (0 bytes)
ChangedFiles 1
ChangedSourceSize 0 (0 bytes)
ChangedMirrorSize 0 (0 bytes)
IncrementFiles 0
IncrementFileSize 0 (0 bytes)
TotalDestinationSizeChange 37069994870 (34.5 GB)
Errors 1


session_statistics.2015-03-22T11:18:18-07:00.data

StartTime 1427048298.00 (Sun Mar 22 11:18:18 2015)
EndTime 1427048521.82 (Sun Mar 22 11:22:01 2015)
ElapsedTime 223.82 (3 minutes 43.82 seconds)
SourceFiles 191334
SourceFileSize 37080046335 (34.5 GB)
MirrorFiles 190944
MirrorFileSize 37069994870 (34.5 GB)
NewFiles 411
NewFileSize 9350513 (8.92 MB)
DeletedFiles 21
DeletedFileSize 8768177 (8.36 MB)
ChangedFiles 465
ChangedSourceSize 408118380 (389 MB)
ChangedMirrorSize 398649251 (380 MB)
IncrementFiles 899
IncrementFileSize 33979051 (32.4 MB)
TotalDestinationSizeChange 44030516 (42.0 MB)
Errors 1

session_statistics.2015-03-29T14:01:04-07:00.data

StartTime 1427662864.00 (Sun Mar 29 14:01:04 2015)
EndTime 1427674000.81 (Sun Mar 29 17:06:40 2015)
ElapsedTime 11136.81 (3 hours 5 minutes 36.81 seconds)
SourceFiles 190331
SourceFileSize 37115088389 (34.6 GB)
MirrorFiles 191334
MirrorFileSize 37080046335 (34.5 GB)
NewFiles 1010
NewFileSize 68810627 (65.6 MB)
DeletedFiles 2013
DeletedFileSize 26435301 (25.2 MB)
ChangedFiles 187778
ChangedSourceSize 37035986594 (34.5 GB)
ChangedMirrorSize 37043319866 (34.5 GB)
IncrementFiles 190801
IncrementFileSize 42530381 (40.6 MB)
TotalDestinationSizeChange 77572435 (74.0 MB)
Errors 0

session_statistics.2015-03-30T15:32:21-07:00.data

StartTime 1427754741.00 (Mon Mar 30 15:32:21 2015)
EndTime 1427755023.97 (Mon Mar 30 15:37:03 2015)
ElapsedTime 282.97 (4 minutes 42.97 seconds)
SourceFiles 190412
SourceFileSize 37121646218 (34.6 GB)
MirrorFiles 190331
MirrorFileSize 37115088389 (34.6 GB)
NewFiles 89
NewFileSize 4118761 (3.93 MB)
DeletedFiles 8
DeletedFileSize 410210 (401 KB)
ChangedFiles 2982
ChangedSourceSize 578210673 (551 MB)
ChangedMirrorSize 575361395 (549 MB)
IncrementFiles 3079
IncrementFileSize 4893512 (4.67 MB)
TotalDestinationSizeChange 11451341 (10.9 MB)
Errors 0

-- 
Bob Hossley
address@hidden