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It really depends on what you consider acceptable and whether or not that will be sufficient for your tastes. I know it sounds cliche but it's the truth. I've compressed movies to as low as 54% but there was obvious pixelation and quality loss, as would be expected. It's the price you pay for keeping the menus and extras.
Now, if you're re-authoring and just keeping the main movie, often your compression ratio will be at 72% or higher, and that is fine for me. You could also backup as a full disc and replace some extras with still images if you insist on keeping the working menus and so forth.
When compression is below 90%, I always run deep analysis and High Quality AEC. It's all a matter of how much time you are willing to give Shrink to encode. Here is how I would chart the quality. (My opinion only! Your level of scrutiny will probably vary.)
90%- 100% Great quality. Backup as is.
80%- 90% Still very good quality, run Deep Analysis and High Quality AEC if you wish.
71%- 80% Good quality but noticable pixelation, definitely run Deep Analysis as well as AEC setting of your choice.
65%- 70% Can still be considered pretty good quality but be prepared to sacrifice fluidity during intense action, Deep Analysis and AEC settings a must.
54%- 64% Acceptable copy but very pixelated, especially at high rates of motion. Absolutely run Deep Analysis and AEC to compensate for major quality loss.
Never seen anything below 54%, so you probably do not need to worry about that. It's give and take, as is much of life, so find a formula that works for you and be willing to take some time to play around with your options. Try different settings, take notes of your results and maybe even keep a log of your burns. Eventually you will find your niche. :-)
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