how creat cron backup

[nimafire]

hello. can anyone answer me.

how can i config this setting in creating cron backup:

Minute:
Hour:
Day of Month:
Month:
Day of Week:

for

3 days a week in all month (i mean one day off between every creating backup)

1 day in a week (i mean 4 times on all month)

tnx

 

[0k.a.b.a0]

1)

0 4 * * 1,3,6 - cron start every 3 days

2)

0 5 * * 7 - cron start every sunday