SKIP & NOSKIP Back No Differnce To Backup Duration

Hi

I run a full backup once a month and a transaction log backup every 10 mins through working hours for the remainder of the month until the backup is re-initialised at th start of the following month.

I backup to virtual sql disk object devices.

As the month progresses the backup takes longer and longer whilst the amount of data being backed up every 10 minutes cycle is always roughly the same. its about 5 seconds for a backup on day 1, up to 5 mins at the end of the month.

I noticed that NOSKIP was being used in the command - i changed this to SKIP, but it made no difference in the amount of time the backup takes. Isnt this suppoed to stop some sort of integrity scan on all other backup sets in the archive?

full syntax of the backup command that runs now is:

BACKUP LOG [objectstore] TO [Backup_objectstore] WITH NOFORMAT , NOINIT , NOUNLOAD , NAME = N'objectstore backup', SKIP , REWIND , STATS = 10

but as I say, the SKIP command instead of NOSKIP makes no difference.

whats going on here?

any help appreciated.

Thanks

Alastair.

"A computer once beat me at chess - but it was no match for me at kick boxing" - Emo Phillips.