From zup's post in the announcement section +9 months ago.
"Squadron Wars and Vault"
zuperman wrote:
3) The Vault points expire. Once a week it will be reset and if a person didn't claim them... they will be lost. Why? Simple, this is to encourage squadron members to play more often and don't go missing for long periods of times.
The way this reads it sounds like the vault points will be be set to zero once a week, but this is not quite accurate. It would be more accurate to say that unclaimed points expire after 7 days.
So, a squad member who has not logged in for 6 months, another who has been gone for 5 weeks and another who last logged in 7 days ago will all have the same amount of coins (the last 7 days worth) waiting for them snug and safe in the vault. Any vault coins earned more than 7 days ago (but not claimed) expire. Once you claim your points from the vault they become yours, you can spend them on planes and upgrades or hold them but they will not expire.
Also, from
"Dogfight Elite 1.0.71 is out!"
zuperman wrote:
- If you belong to a squadron, with every purchase of points you also give a free vault donation to your squad members.
- Subscribers now have more benefits: You get more points with each purchase.
It's a pretty cool way that you can actually gift your squad mates. I don't know for certain but I think that the "free vault donation"s expire after a week also.