Your project will work and go along fine...until the exact time that it doesnt.
I would be maintaining a backup regime that would minimise the damage if that time ever comes ( and it may not)
I think I would manually backup the MASTER PROJECT incrementally and also manually backup portions of it. eg Finished sections. (sequences?)
Depends a bit on how you are editing the sequences? eg flipping back and forth or completing a sequence and moving on to next...
What PPRO vers and what platform are you on?
"Your project will work and go along fine...until the exact time that it doesnt."
A very profound and true statement.
I'm running CS5.5 I7 16GB 1 SSD & 3 HDD, 64 bit Win 7. Tend to complete sequences then move on.