The phrase "minimum increments" refers to the smallest possible steps by which something can change or increase. It refers to the smallest unit of measurement or progress in a particular context. Full definition
For travel purchases charged to your Card that are not booked through Expedia For TD, TD Rewards Points must be redeemed in minimum increments of 200 or 250 points as fully explained in the TD Rewards Program Terms and Conditions («Travel Terms») contained in the TD Travel Credit Cardholder Agreement for your Card. (td.com)
Deposits via automatic transfer from a Trustmark checking or savings account are required in minimum increments of $ 10; transfers are established at account opening for the initial deposit and can be made with myTrustmark ℠. (trustmark.com)
Some may bill for minimum increments of 10 minutes, while others might not bill for less than an hour. (entrepreneur.com)