[Bacula-users] keeping changes for 15 days?

hello
I'm backing up to an HD, not tape, and a good solution for me would be 
something like backing up incrementally and keeping file changes or deleted 
files for up to 15 days
is that possible?

for example:
1) I create file A.TXT and do a full backup on JOB 1
2) during the next 10 days, I change it every day and backup on JOB 2-11
3) 2 months later, I only need the last version of A.TXT, I don't need the 
other 10 versions too

same goes if I delete file A.TXT... if I delete it on day 1, I want to have up 
to day 15 to recover it... after that I don't wanna be able to recover it

is that implemented? I guess it's related to job retention, but I'm afraid 
purging one job will lose information for incremental backups done later, based 
on this job

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