Hello,
I have been using Audacity for the purpose of creating demos for over ten years. Recently, I have begun having issues with tracks not lining up with one another when recorded with a metronome - the tracks being either too ahead or behind it. I have a very bare bones recording setup, using only my laptop’s built in microphone and Sennheiser headphones. I like to think that if I can make music that sounds good on Audacity, using the setup that I have, then I can make it sound good in studio, so I am not really interested in upgrading equipment; I have looked into latency and have attempted to correct the problem this way, but the tracks are still either too ahead or behind the metronome, moreso with the same latency compensation setting after a day or two has gone by.
Since I imported an audacity project from a previous computer, using a portable SSD, I received a notification from OneDrive Personal informing me that I do not have enough cloud storage, and I am wondering if that could be the issue; having attempted to record something with a different program, Vegas 12.0, I had the same problem, so I do not think that it is an issue with the program, specifically.
I am using a Surface Laptop Studio 2. Any and all feedback is appreciated.
Latency compensation adjusts for the differences between the backing track and the newly recorded track.
There was a procedure for measuring & adjusting latency compensation but I think it was in the now-deleted WIKI. 
But you should be able to align the tracks manually before mixing.
That won’t help with a timing difference or drift…
Recording the One Drive could be causing short dropouts which can make the recording shorter and mess-up the timing. But that usually also creates a "click’ or “glitch” in the audio. It’s OK to back-up to the cloud but you should be working “live” with a local disk drive.
Another thing that can cause timing differences is if you are listening to a backing track with your regular soundcard while recording with a USB microphone, or other device. Every device has it’s own clock/oscillator and they WILL drift apart over time. Sometimes consumer soundcards are off by enough to cause pitch or tempo problems. But if your headphones are analog and connected to the same soundcard, they are using the same clock and they shouldn’t drift apart at all.
A useful tool for Audacity to add would be something like the “auto-sync by waveform” function that DaVinci Resolve (and I think Adobe Premiere Pro) has to match up audio tracks perfectly.