I would recommend using a credit card that lets you download your transactions for tracking expenses. Unless you really need the detail of the individual items from your purchases. I tried scanning all my reciepts and found it was a waste of time, now I just scan reciepts for things that were over ~$100 that I might need to return under warranty.
If you get a scanner make sure it has full-duplex (scans both sides of the paper), A document feeder and is network based (beware cheaper models where you still need a driver to make it work).
I have a Brother 8890DW, which has scan to email and (I believe) scan to ftp.
If you are low volume I would definitely look at the camera based scanning options, then you can just use your phone.
As for management I just have a directory full of pdf's which I can search in windows. Simple but effective.
If you get a scanner make sure it has full-duplex (scans both sides of the paper), A document feeder and is network based (beware cheaper models where you still need a driver to make it work).
I have a Brother 8890DW, which has scan to email and (I believe) scan to ftp.
If you are low volume I would definitely look at the camera based scanning options, then you can just use your phone.
As for management I just have a directory full of pdf's which I can search in windows. Simple but effective.