[Dirvish] Irregular dirvish expire rules

[Tuomas Airaksinen]

Hi,

I'm using dirvish on my laptop computer to a USB hard drive. Because
it's laptop, I can't ensure that backups are made regularly every day.
However, dirvish-expire seems to assume that I do backups every day. If,
for example, I set up expire rule

   *   *     *   *         1    +3 months

i.e. monday backups should last three months. Okay - what if I don't do
backup at all on monday? Of course, I would like tuesdays backup to be
saved instead.

My question is: is there any way to make "irregular" expire-rules, such
that would ensure that, for example, in any case, one copy per week
would last 3 months?

-- 
Tuomas Airaksinen, Ph.D. student
University of Jyväskylä, Finland